[38P.11] The Europa Plume as Observed by the Galileo Magnetometer

Evidence for a plasma plume originating at Europa was first
reported by Intriligator and Miller who analyzed data from
Pioneer 10. The plasma in this plume or wake region appears
to be accelerated at Europa to corotational velocities and
to slowly drift outwards. Galileo has passed repeatedly
through the region just exterior to the Europa orbit and
frequently sees a very characteristic disturbance that
appears to be the magnetic counterpart of the Europa plasma
plume. This feature is seen well outside of the orbit of
Europa and shows that there is a significant outflow of
plasma in the region of the magnetosphere around 10 RJ.